Drill-stem clamp for rotary drilling-machines.



H. R. DECKER. DRILL STEM CLAMP r011 ROTARY DRILLING MACHINES. APPLICATION FILED P23. 5, 1908.

899,208. Patentsdfiept. 22, 1908 V aswentcz 19i in cone: M

UNITED STAliiS PATENT OFFICE.

DRILL-STEM CLAMP FOR ROTARY DRILLING-MACHINES.

Specification of Letters Patent.

Patented Sent. 22, 1908.

Application filed February 5. 1908. Serial No. 414%.;44.

most generally used is known as a rotary"' and consists of a table having a central opening for the tubular (lllll stem and a clamp consisting of two lrantes actuated by rightatid-left-threaded screws or other means,

each of said frames having elongated cylindrical hearings on which are rotatably mounted steel disks or rings that engage the drill stun and causes it to rotate with the table. but permits longitudinal movement of the stem so as to allow it to acconnnodate itself to the well boring and also to he raised and lowered mechanically when a hard formation is encountered in the drilling.

My invention consists in mounting the clamping rings or disks on a threaded sleeve which is in turn rotatably mounted on the shaft and the object of my invention is two fold. By having the exterior of the sleeve and the interior of the rings or disks correspondingly threaded admits of adjusting the rings or disks so as to lit any size stem. and by having the bearing the full length of the threaded sleeve equalizes the wear on the shaft and prevents particles of sand. dirt. etc. from getting in the bearing and cutting it.

.\ly invention will be described in detail hereinafter and illustrated in the accompanying drawings in which- Figure 1 is a view of rotary drilling machine with my improved clamp installed thereon, Fig. 22. a detail view of one of the clamping members, and Fig. 3, a cross section of the clamping member shown in Fig. 2.

In the drawings similar reference charac ters indicate corresponding parts throughout the several views. 4

A indicates the rotary table which is turned by means of the shaft B and the drill stem clamps having shafts ll secured thereto These part have heretofore been used in rotary drilling machines and I lay no claim thereto but my invention consists in mountin; exteriorly th aded sleeves 1 on the shafts ll and prov ding the clamping rings the threaded outer surface of sleeves" 1. 3 indicates a lon tudinal groove in the outer surface of each sleeve 1 to form a key seat. 4 a key seat in the disks 2 and a key engaging said key seats to hold the disks 2 in position on the sleeve.

evenly distributed and as there are no interstices for sand. grit. etc" to get between the sleeve and shaft as in machines in which the clamping rings or disks are mounted di rectly on the shaft the clamp will last an in definite time.

Having thus described my invention what I claim is 1. In combination with a rotary drilling machine and a drill stem clamp mounted thercon-lniving shafts secured thereto, sleeves mounted on said shafts and extending substantialiv the full length thereof, and clamp ing devices secured to said sleeves.

l. in combination with a rotary drilling machine and a drill stem clamp mounted thereon having shafts secured thereto, sleeves mounted on said shafts and extending substantially the full length thereof. and clamping rings secured to said sleeves.

3. In combination with a rotary drilling machine. and a drill stem clamp mounted thereon having shafts secured thereto, exteriorly threaded sleeves mounted on said shafts extending substantially the full length thereof. and threaded clamping devices mounted on said sleeves.

4. In combination with a rotary drilling machine. and a drill stem clamp mounted thereon having shafts secured thereto. exteiiorly threaded sleeves mount d on said shafts extending substantially the full length thereof, and threaded rings mounted on said sleeves.

or disks '2 with threaded interiors to engage By this construction as stated above the wear on shafts l) is I I w 5. In comlination with a, rotary chilling I seats corresponding to the key seat in the maclune,. and a (lIlll stem clam) mounted sleeve, and a key engaging said key seats. 10 thereon having shafts secured t lereto, exi In teshmony whereof I hereto affix my termrly threaded sleeves mounted on sald signature 1n the presence of two Wxtnesses. 5 shaft-s extendmg suhstantlally the full length 'llARR Y R. DECKER.

; thereof, each of and sleeves havmg a lqnglfl ltnesses:

; tudmal key scat thereln, threaded rl ngsg JAKE H. 5AM,

' mounted en sald sleeves and having key; E. E. GORDON. 

